package operation;

import book.Book;
import book.BookList;

import java.util.Scanner;

public class DelOperation implements IOPeration{
    @Override
    public void work(BookList bookList) {
        System.out.println("删除图书！");

        //1.找到你要删除的书
        int currentSize = bookList.getUseSize();
        if(currentSize == 0){
            System.out.println("书架为空，不能删除！");
            return;
        }

        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入书名：");
        String name = scanner.nextLine();
        

        int index = -1;
        //如果有这本书，就不能添加了
        for (int i = 0; i < currentSize; i++) {
            Book book1 = bookList.getBook(i);
            if(book1.getName().equals(name)) {
                index = i;
                break;
            }
        }
        //2.index ！= -1 说明有这本书，开始删除
        if (index == -1){
            System.out.println("没有你要删除的书！");
            return;
        }

        for (int i = index; i < currentSize-1; i++) {
           Book book1 =  bookList.getBook(i+1);
           bookList.setBooks(i,book1);
        }

        //当书删掉之后，我们需要维持useSize
        bookList.setUseSize(currentSize-1);
    }
}
